I have a couple of questions about "Carrying a match"

If I get feed on a match, let's say 10/2/4 for example, and I am way ahead of the enemy team and can easy win the match because I outplayed them all, but there's 2 guys on botlane that are feeding hard and are obviously boosted accounts. Why on earth do I have to carry them? Im on a point where LP don't matter to me, so why should I give them free LP when they do not deserve them? Why the hell should the system ban you for literally not making 2 guys that DO NOT DESERVE the win, win? :)
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